Measuring-pump.



F. F. DAVIS L C. G. HOLT.

MEASURING PUMP.

APYLXUATION FILED NOV.15.1909.

Patented July 18, 1911.

2 SHEETS#BHEET 1,

F. F. DAVIS L C. G. HOLT.

MEASURING PUMP.

APPLIGATION HLED Nov. 15. 1909.

Patented July 18, 1911.

2 SHBBTSSHEBT 2.

LX W v UNITED sTATEs PATENT OFFICE.

1 FRED F. DAVIS, OF ST. LOUIS, AND CLUDE G, HOLT, OF WBSTER GBOVES, MISSOURI,

ASSIGNORS T UNITED STATES PUMP AND TANK (LOMEANY, OF ST. LOUIS, MIS- SOURI, A CORPORATION OF MISSOURI.

MEASUBING-PUMP.

Specification of Letters Patent.

Patented July 18, 1911.

To all whom, it may concern:-

Be it known that we, FRED F. DAVIS and' CLAUDE G. HoIIr, both citizens of the United States, residing at. St. Louis-Missouri, and Webster Groves, Missouri, respectively, have invented a certain new and useful Improvement in Measuring-Pumps, of .which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the s211110.

This invention relates to measuring pumps. (lne object of our invention is to provide a measuring pump which is so constructed that the means which controls the stroke of the piston can be adjusted quickly.

Another object is to provide a compact measuring pump that is durable and which can be operated quickly.

Another object is to `provide a measuring pump of-novel construction having a com pression chamber that permits the piston to move sli htly in case the operating means for the p1ston is actuated when the discharge pipe from `the pump cylinder is closed,

thereby preventing the piston-operating "means from becoming damaged or broken.

And still another object of our inventionV is to provide means of novel construction for locking the piston of the ump.

Other objects and desirab e featuresof our invention will bevhereinafter pointed out.

Figure 1 of the drawings is a side elevational view, partly in vertical section, of a measuring pump constructed in accordance with our present invention; Fig. 2 is a top plan view of said pump; Fig. 3 isa horizontal sectional view taken on approximately the line 3*-3 of Fig. 1; Fig. 4 is an enlarged vertical sectional view of the pistonoperating mechanism andthe means which conf trois the upward stroke of the piston; Fig. .-5 is a horizontal sectional view taken on approximately the line 5--5 of Fig. 4; Fig. 6 is a vertical sectional vieyv taken on approximately the line 6-6 oi Fig. 4; and'Fig. 7 is a horizontal sectional view taken on approximately the line 7-'-7 of Fig. 4.

Referring to the drawings which illustrate the preferred form of our invention, A dsignates the cylinder of the pump, and B designates the piston which reciprocates ins side of said cylinder. L The cylinder .is

"supply pi e 2 communicates.

'ment of the piston also causing a char piston.

y lower head of the cylinder, and saidl base is provided `with a' chamber 1 with which the We prefer to provide t e base with two openin si for the supply pipe, one openin being ormed in the side wall of the cham r 1 and the other opening being formed in the bottom of said c amber, as shown clearly in Fig. 1, a plug 3 being provided for closing the opening that. is not in service. An inwardly opening check-valve 4 of any preferred design is arranged in the base for controlling the flow of the liquid to the pump cylinder, and an inwardly opening check-valve ofany preferred design is arranged in the piston B for controlling the low of the liquid from the under side of the piston to the upper side thereof. A rod 6 to which the piston isconnected, projects upwardly'through a stuing-box 7 in the top 8 of the cylinder, and a rack bar 9 is connected to said piston rod for imparting movement thereto. Said rack bar meshes with a inion, 10 secured to a shaft 11 that is provi ed with a handle 12 or other suitable operating device, for imarting rotary movement to said shaft.

he shaft 11 1s journaled in amember' 13 carried by standards 14 which project upwardly from the top 8 of the cylinder, and a guideway 13l is formed in said member 13 for receiving the rack bar 9 to which the piston rod is connected. While we have herein shown a double pinion 10 coperatmg with a rack bar having two sets of teeth,

we do not wish it to be understood4 that our broad idea is limited to this exact construction for various other means than. that herein shown could be employed for operating the piston ofthe pump.

When the shaft 10 is turned in one direction the piston will move upwardl and the liquid on the up er side of said piston will be forced out o the cylinder throu h the discharge pi e 15 that leads from t e upper end of t e cylinder, the upward moveto be drawn into the lower end of thee lmder through the opening which the chec -valve 4' closes. .When the piston moves ,downwardly, the check-valve opens so that the liquid can pass to the upper side of the YOne of the novel features of our present invention consists in the means for oontrol-` means. consists of a -`plurality of sto s carried by the rack bar 9, and ani adjusta le device which is adapted to be arranged in dif-` ferenty positions for engagingy said stops,

thus arresting ther istonatl d1ierent points in its travel. In t e preferred form of our invention asherein shown, the rack-bar 9 is provided with .three stops 1.6, 17 and A18 which project different distances from the rack bar so that they `will cooperate with an adjustable device'19 1thatlies 1n the path of travel of therack bar. The stops 16 18 preferably consist of blocks "of different thicknessesarrangd in a groove 9? on one side of the rack bar 9 and retained in posi-A tion by means 'of set screws 2O `that ss through elongated slots 20 in the 'rack al', as showni'n Fig. .4.; ,The device 19 with which the stops coperate, is reciprocatingly muntedin the member '1.3 and projects into the groove in the rack bar so that it will enfrage one or another of the stops on the rack har when said bar moved upwardly. One means that we have found very eliiclent for4 adjusting the device 19 consists of a disk 21 rotatably mounted in a bearing -21 in the member 13 andprovided onfits under side with an eccentricaily disposed pin 22 that projects into a s1o`t-23 formed in the head piece24 of the device y19, sai'd disk 21 being secured to a' shaft 25. that is provided with a.

. handle 26er. other "suitable operating device. y Movement of the handle 26 causes the device 19 to pojectvfarther into or out of the groove in therack bar, depending, of

course', o n the direction in which the handle is moved thus' varying the position of Asaid device4 re atively tothe stops 'with whichit c co lrats. The `stop v'16 is arranged on the rac harY in suchpaposition that 1t' will engage tljiedevi `19 when a certain quantity 4of li uid hasbeen forced .out of the pump ylin er; sa for exampletoneshalf pint,

the stop 17. ing arranged 1n ,such a. posi` tion that 'the upwardmovement of. the pis-l y ton'wll arrested whena diferent quantity has .been forced out of the cylinder, and the stop 1'8 bein arranged instill a. diiferent position. T e device 19,` of course, has to be adjusted whenever it is l,desired to changel the i1uantity.ofAv 1i uid that is forced out ofV thepcylinderybut t c position of the stops onfithe rackybar is not changd after los-ton they, have once been set. or adjusted in roper When the`device ,19 is a justed 'iiitd `the @position .shown pint, the handle 26 has to be manipulated so as to move the device' -19 outwardly far l' l Y 17 and' in .Fig- 4 the 'Paton j ill be;.arrestedLwlierr` the stop 1,6 strikes said device but ijf-"it is desired Vto `nieasureaV different quantity; jsay, for example, ione" enough yto rmit the stop 16 to pass said `device ontiii; upward stroke of" the piston.

moving the device 19 outwardly still By farther the stops 16 andl 17 will clear it on .the upward stroke of the pistn, and the piston will be arrested when `the stop 18 strikes said device.`

From the foregoingit will be seen that the pump can be adjusted quickly and easily.

to deliver different quantities of liquid by simply changing the position ofthe device 19. Y It will, of course, be understood that various other means than that herein shown could he employed for adjusting the device 19 vvi'thout departing from the spirit offour invention which consists broadly in providing a pump with an .adjustable device that isadaoted' to be arranged in different positions so as to cooperate with a plurality of stops carried by a member that preferable to provide the rack bar with stops of different thicknesses, as herein shown, but .the same result cold. be obtained in various other ways without departing from 'the spirit of our invention.

.Any suitable means canbe -used for locking the mechanism which controls the device 19, such, for example, as a spring-pressed pawl 27 that cooperates with notches or recesses 2S in the p iphery of the disk 21, as shown in Fig. 7. eaid pawl exerts sufficient ressure on the disk Lto hold the device 19 1n the osition to 'which it has been moved, but itl oes not ypositively lock said disk and consequent-ly a slighty fessure on the handle 26 will cause the di to be released from the gew] 27. If desired,l an index or scale can e arranged adjacent the ath in which the operating device for the. i'sk traveis so moves with the piston of the pump. it is ies as to aid the operator in setting the disk 19.Y

In the construction herein shown the handleY 26 is provided with a pointer 29 that coolperateswith a scale 30V on the side face of t e member 13 in which the disk 21 is` mourtd, but it will, of course, be .obvious that various' other means could be employed for this purpose. y*

The standards 14' which support the member 13 in which the inion 10 and device 19 .are mounted, are ho low, as shown in Figs.

1` and 4, and a duct -31-is formed in the upper head-piece 3 of the cylinder so aste establish communication' between the interior of the cylinder and the interior A4of the standard that communicates with said duct.

The object of constructing the pump in this manner is to provide an expansion ch or air chamber at the u amber j per end. bf the cyl Vilider which permits t 1e piston to move .slightly in case .the operating mechanism for samev is actuated when the discharge pipe i.

15 is closed, thereby preventing said piston operating `Illechanlsm from becommg damilaged or broken. That isto sa ,wtha pump'.

of the character herein described, there is no danger of stripping the rack bar or the pinion 1n case the handle 12 is turned when the discharge pipe from the cylinder is closed for there is sufficient air in the hollow standard that communicates with the duct 31 to Vpermit the piston to move u wardly slightly and thus compress the air m said standard.

In Figs. 4 and 6 we have illustrated in detail a means of novel construction for positively locking the piston-operating mechal nism so as to prevent the pump from being operated Aor tampered with by an unauthorized person. Said means comprises one or more dogs 32 that are adapted to engage the teeth on the pinion 10, a movable member r which carries said dogs, and means for locking said member in such a position that said dogs positively hold the pinion from moving. In the construction herein shown the dogs 32 are carried by a housing 33 that is hinged or pivotally connected at 34to the member 13, and said housing is provided with akey-controlled latch 35 of 'any preferred design that is adapted to enga e a stationary catch 36 on the upper side o the member 13. The latch 35 is slidingly mounted in a pocket 'on the under side of the housing 33, and said housin is provided with a rotatable key late 37 t rough which a key can be inserte so as to engage the wall of a slot 35* in the latch 35 and move it out of contact with the catch 36 when the key and key plate are rotated. As soon as the latch has been disengaged from said catch the housing is thrown upwardly by means of a coiled expansion spring 38 mounted in a pocket on the upper side of the member 13, the upward movement of said housing causing t e dogs 36 to pass out of engagement with the teeth of the pinion.

A pump of. the construction herein described is compact 'and durable, and the means which controls the upward movement of the piston is so designed and arranged that it can be operated easily. The expansion chamber that communicates with the cylinder reduces the liability of breakage of the piston-operating mechanism, and the locking mechanism for the iston-operating means is so designed that 1t securely locks the pump and prevents an unauthorized person from manlpulating the pump.

Having thus described our invention, what we claim as new and desire to secure by Lei-- ters Patent is:`

1. A pump provided with a piston, mechanism for operating said piston, a plurality of stops carried by one element of said op erating mechanism and projecting outwardly different distances from said element, said stops being arranged in alinelnent with each other, and an adjustable devlce arranged in alinement with said stops and adapted to be moved into position for engaging one or another of said stops so as to limit the movement of the piston.

2. A pump provided with a reciprocating piston, a piston-operating mechanism comprising a rack bar having elongated openings, a plurality of space stops adjustably mounted in the elongated openings in said rack bar and projecting outward diii'erent distances therefrom, a member provided with a guideway through which said rack bar passes, a reciprocating device carried by said Ymember and adapted to coperate with the stops on said rack bar to limit the movement of the piston, and an oscillating element 4carried by said member and eccentrically connected to said device for changing the position of same relatively to the stops on said rack bar.

3. A pump provided with a reciprocating piston, an operating mechanism for said pis-` ton comprising a rack bar, a plurality of spaced stops on said rack -bar that project outwardly different distances therefrom, said' stops being adapted to be adjusted longitudinally of the rack bar, a member having aguideway through which said rack bar passes, a device slidingly mounted in said member and adapted to coperate with the stopson said rack bar, said device being provided at one end with a head, and an adjustable element rotatably mounted in said member and eccentrically connected to the head on said device.

4. A pump provided with a reciprocating piston, a` rack bar connected with said piston and provided on one side with lan Aelongated slot or channel, a plurality of spaced stops arranged in Saidchannel and projecting outwardly different distances from the bottom wall of the channel, said bottom wall being provided with elongated openings, bolts passing through the elongated openings in said bottom wall for adjustably connecting said stops to said rack bar, a Stationary member through which the rack bar passes, a reciprocating device mounted in said stationary member and projecting into the channel in said rack bar, and means for moving said device into and out of the path of movement lof said stops.

5. A pump provided with a reciprocating piston, a YYrack bar connected with said piston, a toothed actuating element meshing with said rack bar, a stationary member through which lsaid rack bar passes, a movable housing carried by said member and provided with a dog that engages said toothed actuating device, and means for locking vsaid housing in its closed position.

6. A pump provided with a reciprocating piston, a rack bar connected with said piston, a toothed actuating element meshing with said rack bar, a stationary member through which said rack bar passes, said able. housing member being provided with a catch,a movy carried by said member and provided with a dog that enga said toothed actuating device2 and a ey-controlled latch carried by said housing and cooperating with the catch on said stationary member. y

7. A pump, provided with a cylinder, a reciprocatin plstonarranged in said cylinwith said pinion, a plurality of spaced stops ton arranged in said cy on said rack bal', arranged in longitudinal alinement with each other, a device carried by the member through which the rack bar passes and arranged at approximately right angles to said member and means for adjusting said device to different positions for enga ng one or another of the stops on said rack ar.

8; AA pump comprisin a cylinder, a pis- `to said rod, standards connected to inder and provided 4 with a rod that projects upwardly through the top of the cylinder, a rack bar connected Y the top of the cylinder and carryin a member having a guide through whic the rack bar passes, an operating mechanism journaed in said member for actuatin said rack bar, means carried by said mem er for locking said operating mechanism, one of said standards being provided with an air chamber that communicates with the cylinder, a plurality of spaced stops of different thicknesses on said rack bar arranged in longitudinal alinement with each other, an adjustable device carried by the member mounted on said standards for cooperating with the stops on the rack bar' to limit the movement of the iston, and means for moving said device mto and out of the path of said stops. I In testimony whereof, we hereunto aiiix our signatures, in the presence of two witnesses, this twelfth day of November, 1909.

FRED F. DAVIS. CLAUDE G. HOLT.

Witnesses:

WELLS L. CHURCH, ,GEORGE Baxnwnmi. 

